For fingerprints or surface markings, you can clean it dry - use a clean microcloth, breath lightly on the disc, and run the cloth upwards from the center ring to the outer edge, repeating all the way around. I understand that mild dish soap is fine, but I prefer to avoid using liquid on a disc...
My guess -- pretty small demand, aside from a few thousand movie geeks. I think WAC and WB put out these Smilebox discs just to please the fans. I can't see how it would be cost-effective, and certainly wouldn't make back its costs if a standard letterbox edition wasn't also included. I wonder...
Were Loew's Cinerama and Warner Cinerama theaters in NYC the same building, renamed? If different, weren't they both on Broadway? I know I saw movies at the Warner and I recall that was in Times Square, if memory serves...